Related Clues:
- Sign on, receiving a note
- Warning captain, having dived, rejected
- Surfacing submariner's premonition
- Prophetic event
- Boxing shield
- A sign from John Galt
- Sign saying 'Ladies Only?'
- Sign literary character underwater is surfacing
- Room enough to contain Galt's warning
- Old soldiers writing on the wall
- Warning from engineering section
- Gingeva is its technical name
- Sticky substance surrounding roots of teeth?
- Sign of old people
- Warning against involving your setter